<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const num = 100;

      console.log(num); // 输出变量值 100
      console.log(1 + 1); // 输出表达式返回值 2
      console.log(200); // 输出值
      console.log("jack"); // 输出值
    </script>
  </body>
</html>
